Paint-spray booth



Aug. 28,1928. ,es2,4o7

E. H. -NELSON ETAL PAINT SPRAY BOOTH Filed Aug. 1 1927 2 Sheets-Sheet 1mist which has failed to find Patented Aug. 28, 1928.

' UNITED sTATEs- PA'I'IENT OFFICE.

k IDIUND E NELSON AND EGON F. TINGWALL, OF JAMESTOWN, NEW YORK,ASSIGN'OBS- TO JAMESTOWN BLOWEB. COMPANY, OF JAMESTO'WN, NEW YORK, A.GOBPOMTION OI' NEW YORK.

' numeruar noo'm.

Application filed August 18; 1927. Serial No. 813368.

One of the objects' of our invention is the provision of a paint-spraybooth equipped with means for efiectively drawing out paint roper lodgement on the article being spraye and also the aint fumes which areobnoxious and healthestroying. V

Another object of our-invention is to provide means for creatin suctionwithin'the sray booth and centre izing the suction so t at the paintmist or paint-spray failing to find lod ement on the article beingsprayed, and the nmes, will be drawn out of the spraying compartment ofthe booth in an effective manner, from all parts thereof.

Another object of our invention is to pro vide a spraying compartmentand a suction chamber and separate the two by a wall having openingsprovided with means adapted ,to control the 'suction within the sprayingcompartment.

A still further object of our invention is the provision ofa sprayingbooth so equipped that the usual stack or draft flue extending upwardlythrough the roof of the buildin containing the booth, is dispensed with,an wherein provision is made for directin the exhaust out through theside wall of the buildin. V

A sti further object of our invention is to gzovide a spray booth'having an air chamr extending transversely. across its upper end andwherein provision is made for aiding in the exhaust the risin fumes,through the medium of-said air cham ber.

With the above and other objects in view, the invention consists in thenovel features of construction and in the arrangement and combinationofparts to be hereinafter de.- scribed and more particularly pointed outin the subjoined claims.

In the drawings:

Fig. 1 is a front elevation of our improved paint-s ray booth,showingthe same' within a building partly shown in section.

Fig. 2 is a side elevation of the paint-s ray booth on a scale somewhatreduced from ig.

- 1, the same being shown within a building.

Fig. 3 is a vertical section taken 'on' line 3-3, Fig. 1.

Fig. 4 is an enlarged transverse section taken on line 4-4, Fig. 2.

Fig. 5 is a %lan view of the paint-spray booth withina uilding. i

Fig. 6 is a section taken online 6-6, Fig. 3, looking in the directionof the arrow crossing said line. e

Fig. 7 is an enlarged section taken on line 7-7, Fig. 1.

Fig. 78 is an enlarged section taken on line 8-8, Fig. 3, looking towardthe left.

While we have referred to this invention as a paint-spray booth, thetermpaint-spray' is understood to be used broadly so as to in-` cludevarnishes and various other covering material capable of beinsprayed,:and while paint-spray booths of t e general type to which thisinvention belongs are invariably used within. buildings, it wil beapparent that the apparatus may be operated outside of a buildng. Wereferably, however, arrange the inlet and e aust parts of the apparatus-so that the l'atter can advantageously be placed within a building,with the air-inlet of th apparatus extendin into or through a wall ofthe building and t e exhaust extending into or through the same oranother wall of the building.

So far as known, spraybooths of this kind have heretofore been providedwith vertical stacks extending up through the building and exhaustingthrough the roof, which oftentimes makes itnecessary to cut throughseveral floors of a building. With our invention, v

of the' floor the booth may be regardless the inlet and exhaust of theappaplaced on',

- ratus extend laterally from the apparatus and are directed so as toexhaust through one or more walls of abuilding.

In the drawin i ,the numerals 9 and 10 desgnate outer wa ls of abuilding', and 11 the floors thereof. The apset into a corner of one butas this is mereoor, or one of the paratus'is preferabl of the floors ofa bui ding,

ly an advantageous location for the same, it

ma' be otherwise located.

he apparatus comprises a sprayng booth 12 having a spraying compartment13, whc h has side walls 14, made to converge near ther rear ends so asto gradually restrict the transverse' dimension of the compartment alona ortion of its depth. This compartment a so as a to wall 15 and a rearwall 16 at the paint o its greatest restriction. In this compartment,articles to be painted or otherwise coated are arranged and paint orother covering material ssuing from a sprayin nozzle of any approvedtype, is drecte against them. The rear wall of the spraying oompartment13 has a number of superosed transversely-elongated openings 18 ormedtherein, and these are opened to any desired extent, or completelyclosed, as may be found desirable, by Shutter plates 19 pivotallyarranged along the upper ends of said opemngs. For this purpose, hangers20 are Secured to the rear wall 16 of the sprayng compartment, and eachof the Shutter plates 19 has pivot stud 21 at opposte ends, which areseated in said hangers. At one end, each Shutter 'plateis provided witha lug 22 to which is pivotally Secured a connecter bar 23. so connectingsaid Shutter plates that they move in unison and are adapted to o en theopenn s in the rear wall 16 to equal egrees.

To te top wall of the spraying Compartment 13, pulleys 24 are Secured,over which an operatin cord or cable 25 is passed, said cord or cab edepending from said pulleys and having its inner depending end Securedto the Connector bar 23, as at 26. The outer depending end of said cordor cable passes through a forked retainer 27 fastened to one of the sidewalls 14 of the booth, and it is provided with a series of retainercollars 28, which are spaced apart, and anyone of which is adapted to beengaged with the under side of the forked retainer 27. The outer end ofsaid cord or cable is provided with a handle 29 for Convenientlymanipulatng the shutter lates. These Shutter plates g'ravitate under' teir weight, and consequently it is only necessary to release theOperating cord or cable from the forked retainer 27 and allow said cordor cableto be moved over its co-acting pulleys under the weight of theShutter plates 'and the Connector bar attached to the outer endsthereof. When the Shutter plates are closed to the desired degree, theretainer collar directly beneath the f orked retainer will be moved intocontact with the under side of said retaiier, and thus hold said platesin adjusted position. It is, of course, apparent that the Shutter platesmay be otherwise manipulated.

The use of the shutterplates in connection with the openings in the rearwall of the spraying c'ompartment, form what may be termed a louvrestructure for the escape of the paint mist and fumes. Therefore, weconsder it within the. scope of our invention to attach said plates infixed relation to said rear wall, although it will be apparent that byhinging or pivotally attaching them as 'shown and described, certainadvantages not otherwise attainable, are' secured. These Shutter platesmay also be termed bafile'plates, since they serve to ba'file the paintmist and compel it to take an upward and rcarward course through therear wall 16 of the spraying compartment.

In rear of the spraying compartment, a suction or ej ector chamber 30 isprovided, and the rear wall of the ,spraying compartment serves as thefront wall for this chamber This suction or ejector chamber has a topwall 31, which may be an extension of the top wall of the spra ingcompartment, a rear wall 32 and side wa s 33, 34; the side wall 33 beingcurved to merge into said rear wall and the side wall' 34 beingpreferably at right an les to said rear wall.

pening laterally into the suction or ejector chamber at the upper end ofthe side wall. 34, is an exhaust funnel 35, the inner end of which isrectangular and of considerable height, as shown at 36, F igs. 3 and 4,while the outer end thereof is cylindrical and extends thro7ugh one ofthe walls of the building, as at 3 Arranged outside of the .spray boothis a blower 38, the eye of which has an air-inlet tube 39 connectedthereto which extends through a wall of the building, as at 40. Theexhaust of this blower is designated by the numeral 41, and istangentially dis osed in the usual manner, and it has connecte theretoan exhaust-noz'zle 42 which extends into the suction or ejector chamber30 through the curved side wall of the same. This exhaust nozzle isdirccted toward the enlarged inner end of the exhaust fun'nel andterminates within the suction or ejector chamber approximately midwaybetween its up er and ower ends. This nozzle may be inc uded in the termexhaust of the blower and connected to this exhaust is an-air tube 43,which extends upwardly and forwardly and is connected with an airchamber 44 disposed transversely along the upper wall of the sprayingcompartment at its froit end. This air chamber has an inclined innerwall in which numerous air-escape openings 45 are arranged which directair from said chamber downwardly and inwardly into the sprayingcompartment.

Connecting the air tube 43 with the side wall 34 of the suction orejector chamber 30 is an air tube 46. This air tube opens into thesuction or ejector chamber in line with the exhaust funnel thereof. Inthe air tube 43 between the air tube 46 and the exhaust of the blower, aValvc 47 is arranged, which.

when closed, shuts off the air current to both the air chamber 44 andthe air tube 46. In the air tube 43 between the air tube 46 and the airchamber 44, a valve 48 is provided, which when closed, prcvents the airbeing supplied to said air chamber. In the air tube 46, a valve 49 isarranged so that this air may be shut off independent of the air tube43. The blower is operated by means of an electric motor 50.

By gradually decreasing the width of the spraying compartnient alon itsrear portion and consequently diminishng the wdth of the louvered rearwall, the suction action on the paint mist and pant fumes is such thatthey are concentrated in their rearward passa e through said louveredwall, with the resu t that the mist and fumes are more eficetively actedupon and brought in concentrated form into the suction or ejectorchamber 30 where they encounter the high pressu-re air stream issuingfrom the exhaust nozzle 42 and are carried through the exhaust funnel35.

The paint mist driven throu h the exhaust funnel encounters a shield 51astened to the wall of the building and inclined downwardly andoutwardly over` the outlet of said exhaust funnel, with the result thatthe mist accumulates on said shield and drips from the edge thereof ontothe ground, thus preventing soiling of surroundings onto or againstwhich the paint mist would otherwise be directed.

The operation of the device is as follows The article to bepaint-sprayed, or otherwise coated, is'placed within thesprayingcompartment 13 and the paint directed thereagainst with aspraying nozzle, in the usual manner. The blower, when operated exhauststhrough the exhaust nozzle 42, a current of air under high pressurebeing directed V across the rear of the louvered wall 16 which separatesthe sprayng com artment 13"fron the suction or ejector cham er 30. Thecurrent of air directed from the nozzle passes out through the exh'austfunnel and by reason of this nozzle being located inrear of said rearwall, it creates suction through the openings of said rear wall and atthe rear of the spraying compartment; the suction being substantia-lleven at all openings of said rear wall, or at east effective over theentire area of said 'rear wall, so that the paint-mist and fumes withinthe spraying compartment are drawn upwardly between theshutter or louvreplates` and carried out through the exhaust funnel by the exhaust of theblower, the mist-laden exhaust being directed against the shield 51arranged over the outlet of said funspraying nel to prevent the sprayingof surroundings with aint or other :covering material, as heren eforementioned. r

The suction created at the rear end of the compartment causes a partialvacuum to be established, and as the front of the spraying compartmentis open, there will be an inrush of air into the compartment, with theresult that even though the operator is stationed within the front endof said compartment, he will not ordinarily come in contact with any ofthe' paint mist or fumes. But, if 'for any reason the umes appear'to beretained within the spraying compartment,

it is only necessary to open the valves 47' and 48 in the air tube 43,whereupon a current of air will be directed into the air chamber 44.

at the u per end of the spraying compartthe louvered rear wall' of saidcompartment and cause the fumes to be carried out into'the suction orejector chamber 30, where the action of the main exhaust from theexhaust nozzle will carry the fumes out throu h the exhaust funnel withthepaint-mist. hould it be found that a speeding up of the exhaust isdesired, the valve 49 in the air tube 46 may be opened, whe'eupon across current of air is directed through the upper end of the suction orejcctor chanber, which cross current is forced directly into the exhaustfunnel and accelerates the passa e of the paint-mist and fumes throughsaid unnel.

It will be clear that upon closing the valve 48 and openin the valves 47and 49 this cross current'may e maintained'without directing the airinto the air chamber 44. U on closin the valve 49 and having the va ves47 and 48 open, the air may be directed into the air chamber withoutdirecting it into the suction or ejector chamber. .Upon opening all ofthe valves, both a cross current of air into the exhaustfunnel may beprovided and also air currents directed downwardly and inwardly from theupper front end of the spraying compartment, The suction in the sprayingcompartment may be increased or diminished upon manipulation of theShutter or louvre plates in the manner hereinbcfore mentioned. V Havingthus described our invention,what we claim is 1. A paint-spray booth,com rising a spraying compartment having si e walls, a top wall and arear wall provided with openngs, a sucton-nducn devce m rear of saidrear wall, an air ehamber at the upper end of said spraying'compartmenthaving a top wall,

side walls and a rear wall provided with openngs, a suction chamber nrear of sad sprayng compartment,` a sucton-nducng 4 device to createsuction through the openings of said rear wall, and means to directcurrents of air toward said rear wall rom the upper front portion ofsaid spraying compa-tment.

3. A paint-spraybooth, comprising a spraying compartment and a suctionchamber in rear of said compartment separated from the latter by adividing wall provided with openings therethrough, an exhaust funnelhaving an enlarged inner end opening into said suction chamber along theupper portion of one of its side walls and being gradually reduced insize outwardly, a blower outside of said booth having an exhaustextending through the other side wall of said suction chamber, and anexhaust nozzle attached to said exhaust extending u wardly and inwardlytherefrom toward t e enlarged inner end of said exhaust funnel, andmeans for Operating said blower.

4. A paint-spray booth, comprising a spraying compartment and a suctionchamber separated from said spraying compartment by a wall havingopenings therethrough, said suction chamber having an exhaust directedlaterally therefrom, an air chamber extending transverscly across thefront of said sprayin'g compartment along its upper end, a bloweroutside of said booth havn an exhaust directed into said suction boothto cause a current of air to be directed therefrom into the exhaust ofsaid suction chamber, and an air tube leading from the exhaust of saidblower to said air chamber.

5. A paint-spray booth, comprising a spraying compartment and a suctionchamberin rear of said spraying compartment and separated therefrom by awall havin openings therethrough, an exhaust for sad suction chamber inone of its side walls, a blower outside of said booth having an exhaustnozzle extending into said suction chamber to direct a current of airacross said suction chamber toward the exhaust thereof, and an air tubeconnected to the exhaust nozzle of said blower and leading into saidsuction chamber above said nozzle, said air tube being adapted to directa current of air through said suction chauber into the exlaust of thesame.

6. A paint-spray booth, comprising a spraying compartment open at itsfront end, a suction chamber in rear of said spra ing compartnent andseparated therefrom y a dividing wall having openings therethrough, saidsuction chamber having an exhaust funnel opening thereinto through oneof its side walls along the upper end thereof, a blower outside of saidbooth havin an exhaust extending into said suction cTamber through theother side wall thereof and being directed toward said exhaust funnel,an air chamber at the upper end of said spraying com artment havng airopenings therethroug directed toward said dividng wall, an air tubeextending from the exhaust of said blower to said air chamber, an airtube extending from said first-mentioned air tube into said suctionchamber in line with the exhaust funnel thereof, and valves in said airtubes to control the passage of air therethrough.

7. A paint-spray booth having a spraying compartment and a suctionchamber separated from said spraying compartment by n dividing wallhaving openings therethrough, an exhaust funnel extending laterall fromone of the side walls of said suction c amber and being graduallyrestricted from said wall outwardly and terminating in a c lin- .dricalouter portion, said exhaust funne extending' along the upper portion ofsaid side wall, a blowe' Situated outside of said booth and having anexhaust provided With an exhaust nozzle cxtending` through the oppositeside wall of said suction chamber at a low point thereof, said nozzlebeing directed up-- wardly and inwardly to cause a current of air topass the-efrom into said exhaust funnel, and means for Operating saidblower.

In testimony whereof we affix our signatures.

EDMUND H. NELSON. EGON F. TINGWALL.

